The post says they'd block ads from their own network that violate the standard as well
Strictly, neither does Google, as long as they are following the industry group's standard. Sure, Google is a member of that group and may be able to influence the standard, but so are a lot of other companies, from Facebook to the Washington Post. I doubt any one company can run away with the standard without the others having a say, or at least making a big stink.